Yes, polluted water is the water whose quality has been degraded by the addition of substances such as chemical effluents, metal residues, sewage, oil, fertilisers, detergents, etc. It can be controlled by the following methods (i) Industrial waste discharge from paper, fertilisers, pesticides, detergents, drugs industries and refineries should not be allowed to get mixed in water bodies such as river, lakes, etc. {ii) Non-biodegradable detergents should be avoided and only biodegradable detergents should be used for cleaning of clothes.{iii) The pH of water should be checked.(iv) Excessive use of fertilisers should be prevented.(v) Oil spills should be avoided as much as possible.{vi) Domestic waste water should be properly discharged and treated.(vii) Avoid the use of DDT, malathion at home.(viii) Waste water should be treated in sewage treatment plant.